Hello everyone! This is my repo for all my leetcode submissions from starting today.

LeetCode Topics

Array

0004-median-of-two-sorted-arrays
0027-remove-element
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0051-n-queens
0055-jump-game
0056-merge-intervals
0057-insert-interval
0063-unique-paths-ii
0064-minimum-path-sum
0066-plus-one
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0078-subsets
0079-word-search
0081-search-in-rotated-sorted-array-ii
0088-merge-sorted-array
0090-subsets-ii
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0118-pascals-triangle
0119-pascals-triangle-ii
0128-longest-consecutive-sequence
0130-surrounded-regions
0135-candy
0137-single-number-ii
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0217-contains-duplicate
0238-product-of-array-except-self
0240-search-a-2d-matrix-ii
0260-single-number-iii
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0380-insert-delete-getrandom-o1
0410-split-array-largest-sum
0435-non-overlapping-intervals
0455-assign-cookies
0456-132-pattern
0493-reverse-pairs
0500-keyboard-row
0540-single-element-in-a-sorted-array
0542-01-matrix
0682-baseball-game
0733-flood-fill
0792-binary-search
0890-lemonade-change
0907-koko-eating-bananas
0940-fruit-into-baskets
0941-sort-array-by-parity
0952-word-subsets
0966-binary-subarrays-with-sum
0967-minimum-falling-path-sum
0978-valid-mountain-array
0985-bag-of-tokens
1036-rotting-oranges
1046-max-consecutive-ones-iii
1171-shortest-path-in-binary-matrix
1370-count-number-of-nice-subarrays
1408-find-the-smallest-divisor-given-a-threshold
1424-maximum-candies-you-can-get-from-boxes
1538-maximum-points-you-can-obtain-from-cards
1559-cherry-pickup-ii
1571-allocate-mailboxes
1605-minimum-number-of-days-to-make-m-bouquets
1612-avoid-flood-in-the-city
1776-minimum-operations-to-reduce-x-to-zero
1803-average-waiting-time
1876-map-of-highest-peak
2144-maximum-difference-between-increasing-elements
2170-count-number-of-maximum-bitwise-or-subsets
2179-most-beautiful-item-for-each-query
2237-longest-palindrome-by-concatenating-two-letter-words
2292-counting-words-with-a-given-prefix
2320-find-all-k-distant-indices-in-an-array
2533-bitwise-xor-of-all-pairings
2737-row-with-maximum-ones
3142-longest-unequal-adjacent-groups-subsequence-ii
3194-find-words-containing-character
3307-find-the-maximum-sum-of-node-values
3311-ant-on-the-boundary
3321-type-of-triangle
3639-zero-array-transformation-i
3647-zero-array-transformation-iii
3747-maximum-difference-between-adjacent-elements-in-a-circular-array

Dynamic Programming

0022-generate-parentheses
0055-jump-game
0062-unique-paths
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0118-pascals-triangle
0119-pascals-triangle-ii
0124-binary-tree-maximum-path-sum
0131-palindrome-partitioning
0152-maximum-product-subarray
0338-counting-bits
0392-is-subsequence
0410-split-array-largest-sum
0435-non-overlapping-intervals
0542-01-matrix
0650-2-keys-keyboard
0803-cheapest-flights-within-k-stops
0967-minimum-falling-path-sum
1250-longest-common-subsequence
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1559-cherry-pickup-ii
1571-allocate-mailboxes
1986-largest-color-value-in-a-directed-graph
2061-painting-a-grid-with-three-different-colors
2090-number-of-ways-to-arrive-at-destination
3142-longest-unequal-adjacent-groups-subsequence-ii
3307-find-the-maximum-sum-of-node-values

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0069-sqrtx
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0240-search-a-2d-matrix-ii
0278-first-bad-version
0350-intersection-of-two-arrays-ii
0374-guess-number-higher-or-lower
0410-split-array-largest-sum
0441-arranging-coins
0456-132-pattern
0493-reverse-pairs
0540-single-element-in-a-sorted-array
0792-binary-search
0907-koko-eating-bananas
1046-max-consecutive-ones-iii
1408-find-the-smallest-divisor-given-a-threshold
1605-minimum-number-of-days-to-make-m-bouquets
1612-avoid-flood-in-the-city
1776-minimum-operations-to-reduce-x-to-zero
2179-most-beautiful-item-for-each-query

Divide and Conquer

0004-median-of-two-sorted-arrays
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0148-sort-list
0191-number-of-1-bits
0215-kth-largest-element-in-an-array
0240-search-a-2d-matrix-ii
0347-top-k-frequent-elements
0493-reverse-pairs

Binary Indexed Tree

0493-reverse-pairs

Segment Tree

0493-reverse-pairs

Merge Sort

0148-sort-list
0493-reverse-pairs

Ordered Set

0456-132-pattern
0493-reverse-pairs

Two Pointers

0019-remove-nth-node-from-end-of-list
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0061-rotate-list
0075-sort-colors
0088-merge-sorted-array
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0160-intersection-of-two-linked-lists
0234-palindrome-linked-list
0350-intersection-of-two-arrays-ii
0392-is-subsequence
0455-assign-cookies
0941-sort-array-by-parity
0985-bag-of-tokens
2320-find-all-k-distant-indices-in-an-array
3683-find-the-lexicographically-largest-string-from-the-box-i

Sorting

0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0148-sort-list
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0435-non-overlapping-intervals
0455-assign-cookies
0941-sort-array-by-parity
0985-bag-of-tokens
1029-vertical-order-traversal-of-a-binary-tree
1571-allocate-mailboxes
2179-most-beautiful-item-for-each-query
3307-find-the-maximum-sum-of-node-values
3321-type-of-triangle
3647-zero-array-transformation-iii

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0051-n-queens
0078-subsets
0079-word-search
0090-subsets-ii
0126-word-ladder-ii
0131-palindrome-partitioning
0216-combination-sum-iii
0257-binary-tree-paths
2170-count-number-of-maximum-bitwise-or-subsets

Bit Manipulation

0067-add-binary
0078-subsets
0090-subsets-ii
0137-single-number-ii
0191-number-of-1-bits
0260-single-number-iii
0338-counting-bits
0461-hamming-distance
2170-count-number-of-maximum-bitwise-or-subsets
2323-minimum-bit-flips-to-convert-number
2533-bitwise-xor-of-all-pairings
3307-find-the-maximum-sum-of-node-values
3600-find-the-k-th-character-in-string-game-i

Enumeration

2170-count-number-of-maximum-bitwise-or-subsets
3683-find-the-lexicographically-largest-string-from-the-box-i
3761-maximum-difference-between-even-and-odd-frequency-ii

Hash Table

0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0037-sudoku-solver
0073-set-matrix-zeroes
0076-minimum-window-substring
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0126-word-ladder-ii
0127-word-ladder
0128-longest-consecutive-sequence
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0160-intersection-of-two-linked-lists
0166-fraction-to-recurring-decimal
0217-contains-duplicate
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0355-design-twitter
0380-insert-delete-getrandom-o1
0409-longest-palindrome
0424-longest-repeating-character-replacement
0500-keyboard-row
0940-fruit-into-baskets
0952-word-subsets
0966-binary-subarrays-with-sum
1029-vertical-order-traversal-of-a-binary-tree
1238-alphabet-board-path
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1612-avoid-flood-in-the-city
1776-minimum-operations-to-reduce-x-to-zero
1986-largest-color-value-in-a-directed-graph
2237-longest-palindrome-by-concatenating-two-letter-words
2461-amount-of-time-for-binary-tree-to-be-infected
2596-add-edges-to-make-degrees-of-all-nodes-even
3445-lexicographically-minimum-string-after-removing-stars

Prefix Sum

0238-product-of-array-except-self
0410-split-array-largest-sum
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1538-maximum-points-you-can-obtain-from-cards
1776-minimum-operations-to-reduce-x-to-zero
3311-ant-on-the-boundary
3639-zero-array-transformation-i
3647-zero-array-transformation-iii
3761-maximum-difference-between-even-and-odd-frequency-ii

Union Find

0128-longest-consecutive-sequence
0130-surrounded-regions
0547-number-of-provinces
1058-lexicographically-smallest-equivalent-string

Math

0002-add-two-numbers
0013-roman-to-integer
0050-powx-n
0062-unique-paths
0066-plus-one
0067-add-binary
0069-sqrtx
0070-climbing-stairs
0166-fraction-to-recurring-decimal
0258-add-digits
0263-ugly-number
0292-nim-game
0380-insert-delete-getrandom-o1
0441-arranging-coins
0492-construct-the-rectangle
0650-2-keys-keyboard
1370-count-number-of-nice-subarrays
1411-convert-binary-number-in-a-linked-list-to-integer
1529-max-difference-you-can-get-from-changing-an-integer
1571-allocate-mailboxes
3172-divisible-and-non-divisible-sums-difference
3321-type-of-triangle
3600-find-the-k-th-character-in-string-game-i

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0424-longest-repeating-character-replacement
0940-fruit-into-baskets
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
1776-minimum-operations-to-reduce-x-to-zero
3761-maximum-difference-between-even-and-odd-frequency-ii

String

0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0058-length-of-last-word
0067-add-binary
0076-minimum-window-substring
0079-word-search
0126-word-ladder-ii
0127-word-ladder
0131-palindrome-partitioning
0166-fraction-to-recurring-decimal
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0392-is-subsequence
0409-longest-palindrome
0424-longest-repeating-character-replacement
0500-keyboard-row
0952-word-subsets
1058-lexicographically-smallest-equivalent-string
1238-alphabet-board-path
1250-longest-common-subsequence
1302-delete-characters-to-make-fancy-string
1460-number-of-substrings-containing-all-three-characters
2237-longest-palindrome-by-concatenating-two-letter-words
2292-counting-words-with-a-given-prefix
2373-apply-discount-to-prices
3142-longest-unequal-adjacent-groups-subsequence-ii
3194-find-words-containing-character
3445-lexicographically-minimum-string-after-removing-stars
3683-find-the-lexicographically-largest-string-from-the-box-i
3761-maximum-difference-between-even-and-odd-frequency-ii

Greedy

0055-jump-game
0135-candy
0409-longest-palindrome
0410-split-array-largest-sum
0435-non-overlapping-intervals
0455-assign-cookies
0890-lemonade-change
0985-bag-of-tokens
1529-max-difference-you-can-get-from-changing-an-integer
1612-avoid-flood-in-the-city
2237-longest-palindrome-by-concatenating-two-letter-words
3307-find-the-maximum-sum-of-node-values
3445-lexicographically-minimum-string-after-removing-stars
3647-zero-array-transformation-iii

Stack

0020-valid-parentheses
0114-flatten-binary-tree-to-linked-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0234-palindrome-linked-list
0456-132-pattern
0682-baseball-game
3445-lexicographically-minimum-string-after-removing-stars

Monotonic Stack

0456-132-pattern

Simulation

0067-add-binary
0258-add-digits
0682-baseball-game
1803-average-waiting-time
3311-ant-on-the-boundary
3600-find-the-k-th-character-in-string-game-i

Number Theory

0258-add-digits

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0355-design-twitter
0789-kth-largest-element-in-a-stream
0803-cheapest-flights-within-k-stops
1612-avoid-flood-in-the-city
3445-lexicographically-minimum-string-after-removing-stars
3647-zero-array-transformation-iii

Matrix

0037-sudoku-solver
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0130-surrounded-regions
0240-search-a-2d-matrix-ii
0542-01-matrix
0733-flood-fill
0967-minimum-falling-path-sum
1036-rotting-oranges
1171-shortest-path-in-binary-matrix
1559-cherry-pickup-ii
1876-map-of-highest-peak
2737-row-with-maximum-ones

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
2292-counting-words-with-a-given-prefix

Recursion

0002-add-two-numbers
0025-reverse-nodes-in-k-group
0050-powx-n
0206-reverse-linked-list
0234-palindrome-linked-list
3600-find-the-k-th-character-in-string-game-i

Depth-First Search

0079-word-search
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0124-binary-tree-maximum-path-sum
0130-surrounded-regions
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0207-course-schedule
0210-course-schedule-ii
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0386-lexicographical-numbers
0543-diameter-of-binary-tree
0547-number-of-provinces
0662-maximum-width-of-binary-tree
0733-flood-fill
0803-cheapest-flights-within-k-stops
1029-vertical-order-traversal-of-a-binary-tree
2461-amount-of-time-for-binary-tree-to-be-infected
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Brainteaser

0292-nim-game
2533-bitwise-xor-of-all-pairings

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0025-reverse-nodes-in-k-group
0061-rotate-list
0083-remove-duplicates-from-sorted-list
0114-flatten-binary-tree-to-linked-list
0141-linked-list-cycle
0142-linked-list-cycle-ii
0146-lru-cache
0148-sort-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0328-odd-even-linked-list
0355-design-twitter
1411-convert-binary-number-in-a-linked-list-to-integer

Game Theory

0292-nim-game

Design

0146-lru-cache
0297-serialize-and-deserialize-binary-tree
0355-design-twitter
0380-insert-delete-getrandom-o1
0789-kth-largest-element-in-a-stream

Doubly-Linked List

0146-lru-cache

Tree

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0543-diameter-of-binary-tree
0662-maximum-width-of-binary-tree
0789-kth-largest-element-in-a-stream
1029-vertical-order-traversal-of-a-binary-tree
2461-amount-of-time-for-binary-tree-to-be-infected
3307-find-the-maximum-sum-of-node-values
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0126-word-ladder-ii
0127-word-ladder
0130-surrounded-regions
0199-binary-tree-right-side-view
0207-course-schedule
0210-course-schedule-ii
0297-serialize-and-deserialize-binary-tree
0542-01-matrix
0547-number-of-provinces
0662-maximum-width-of-binary-tree
0733-flood-fill
0803-cheapest-flights-within-k-stops
1029-vertical-order-traversal-of-a-binary-tree
1036-rotting-oranges
1171-shortest-path-in-binary-matrix
1424-maximum-candies-you-can-get-from-boxes
1876-map-of-highest-peak
2461-amount-of-time-for-binary-tree-to-be-infected
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Binary Tree

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0112-path-sum
0114-flatten-binary-tree-to-linked-list
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0257-binary-tree-paths
0297-serialize-and-deserialize-binary-tree
0543-diameter-of-binary-tree
0662-maximum-width-of-binary-tree
0789-kth-largest-element-in-a-stream
1029-vertical-order-traversal-of-a-binary-tree
2461-amount-of-time-for-binary-tree-to-be-infected

Graph

0207-course-schedule
0210-course-schedule-ii
0547-number-of-provinces
0803-cheapest-flights-within-k-stops
1424-maximum-candies-you-can-get-from-boxes
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination
2596-add-edges-to-make-degrees-of-all-nodes-even

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Binary Search Tree

0789-kth-largest-element-in-a-stream

Data Stream

0789-kth-largest-element-in-a-stream

Counting

0347-top-k-frequent-elements
1986-largest-color-value-in-a-directed-graph
2237-longest-palindrome-by-concatenating-two-letter-words

Randomized

0380-insert-delete-getrandom-o1

Topological Sort

0207-course-schedule
0210-course-schedule-ii
1986-largest-color-value-in-a-directed-graph
2090-number-of-ways-to-arrive-at-destination

Memoization

0070-climbing-stairs
1986-largest-color-value-in-a-directed-graph

Shortest Path

0803-cheapest-flights-within-k-stops
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
2090-number-of-ways-to-arrive-at-destination

Trie

0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order

Combinatorics

0062-unique-paths

Interactive

0278-first-bad-version
0374-guess-number-higher-or-lower

Bucket Sort

0347-top-k-frequent-elements